As fun as it is to ridicule the FBI for devoting massive resources to chasing down Hillary Clinton's oppo research while blowing off repeated, specific warnings about school shooter Nikolas Cruz, we've put a lot on the agency's plate.

We're hauling in nearly 2 million manifestly unvetted Third World immigrants every year, leading to a slew of FBI "Watch Lists" with a million names apiece. In 2015, Director James Comey said that there were ISIS investigations in all 50 states -- even Idaho and Alaska! And that's just one terrorist organization.

Maybe the FBI brass would still be a bunch of incompetent, PC nincompoops if we weren't dumping millions of psychotic and terrorist foreigners on the country. But even the most efficient organization would have trouble keeping track of the Nikolas Cruzes when our immigration policies require approximately one-third of the country to be constantly watching another third of the country.

Thanks to our Second Amendment, the United States has fewer mass shootings per capita than many other developed countries, including Norway, France, Switzerland, Finland, Belgium and the Czech Republic. (And 98 percent of our mass shootings occur in "gun-free zones.")

But imagine if we could cut our mass shootings in half?

There have been about 34 mass shootings since 2000. Forty-seven percent -- 16 -- were committed by first- and second-generation immigrants, i.e. people who never would have been here but for Teddy Kennedy's 1965 immigration act.

And the immigrant mass shootings have been some of the most spectacular ones, such as Fort Hood and San Bernardino. Two of the deadliest mass shootings in U.S. history, at Virginia Tech in 2007 and at the Pulse Nightclub in 2016, were committed by first- and second-generation immigrants, i.e., people who were in this country because Teddy was pouting in his room and refused to come out until he got his own legacy.

(Excluded from both lists: the Las Vegas shooting, because law enforcement has released nothing but lies about it, so that shooting remains unclassifiable; family dispute shootings; targeted assassinations of police officers; and shootings on Indian reservations.)

Here's the list of immigrant mass shootings, defined as a shooting at the same general time and location, not during the commission of another crime, that leaves at least four people dead -- i.e. no gangland shootings, no "man kills family, then self" and no drug deals gone bad.

On account of the Rule of Journalism that permits the word "immigrant" to be used only in sentences with the word "valedictorian," you may not have heard of some of these mass shootings at all.

1) Omar Mateen, son of Afghan immigrants, killed 49 people at the Pulse nightclub in Orlando on June 12, 2016.

2) First- and second-generation Pakistani immigrants Syed Rizwan Farook and Tashfeen Malik opened fire at a community center Christmas party in San Bernardino, California, on Dec. 2, 2015, killing 14 people.

3) English immigrant Christopher Harper-Mercer killed 9 people at Umpqua Community College in southwest Oregon on Oct. 1, 2015.

4) Kuwaiti immigrant Mohammad Youssef Abdulazeez shot and killed five people in attacks on two military installations in Chattanooga, Tennessee, on July 16, 2015.

5) Second-generation Malaysian immigrant Elliot Rodger killed six people on May 23, 2014, around the campus of the University of California, Santa Barbara.

6) Second-generation immigrant John Zawahri opened fire at his Southern California home and later at the campus of Santa Monica College on June 7, 2013, killing five in all. (The New York Times never mentioned that he was the child of Lebanese immigrants. The Times didn't even mention that his Arab father used to beat up his mother, despite that paper's usual heightened interest in stories about men being mean to women.)

7) Cuban immigrant Pedro Alberto Vargas fatally shot six people in his apartment complex in Hialeah, Florida, on July 26, 2013.

16) Mexican immigrant Salvador Tapia shot up the Windy City Core Supply warehouse in Chicago in 2003, killing six of his former co-workers.

If you missed your favorite immigrant mass shooting, please note that I excluded Jamaican immigrant Colin Ferguson (Long Island Railroad massacre in 1993); Nigerian immigrant Peter Odighizuwa (Appalachian School of Law shooting in 2002); Haitian illegal immigrant Kesler Dufrene (North Miami shooting in 2012); and Nigerian immigrant Henry Williams Obotetukudo (Bronx-Lebanon Hospital shooting in 2017). We are only counting mass shootings since 2000 that left at least four people dead.

First- and second-generation immigrants have committed more than 40 percent of all mass shootings since 2000. I know we've been admitting Third World immigrants at a breakneck pace, but I don't think immigrants make up nearly half the population yet.

Once we exclude the immigrant mass shooters, a clearer pattern emerges. The typical American perpetrator is a young man with paranoid schizophrenia -- or, as we're now euphemistically calling it, "autism" -- probably exacerbated by pot, a deadly combo platter.

An immigration moratorium and widespread deportations would not only cut mass shootings in half, but it would also free up the FBI's time to focus on these delusional young men with the terrifying stare, who hear voices no one else hears.